By definition, a Baseball is "9 to 9.25 inches or 22.86 to 23.495 centimeters in circumference." That means that the diameter is between 2.864788975 and 2.944366447 inches or 7.276564 and 7.478691 centimeters (an average of 2.904577711 inches or 7.377627 centimeters).
The weight is defined as, "between 5 and 5.25 ounces or 141.747615625 and 148.8349964063 grams."
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Under current Major League Baseball rules, a regulation baseball is 9 to 9.25 inches (22.9 to 23.5 cm) in circumference -- the equivalent of a diameter of 2.75 to 3 inches (6.99 to 7.62 cm) -- and it weighs 5 to 5.25 ounces (142 to 149 grams).
1978 Rawlings All Star Game BaseballsRawlings started to make All-Star baseballs in 1979 that features The All-Star logo. Before 1979 Official Major League baseballs were used. National league baseballs were used when the game was played in a National League Park, and American League baseballs in American League parks. Rawlings first started to make World Series baseballs in 1978 that features The World Series logo.
The only factory authorized by MLB to make their baseballs is one owned by the Rawlings Sporting Goods Company in Turrialba, Costa Rica. Rawlings has the contract to supply MLB with baseballs through 2013.
The National League Spalding baseballs along with the American League Reach Baseballs (owned by Spalding) were used in Major league baseball for about 100 years until Rawlings took over in 1977, and Rawlings have been making major league baseballs ever since.
Baseballs are not reused once it has been removed from the game. These balls get recycled into batting practice balls.
Major League Baseballs are made in Turrialba, Costa Rica; this is most certainly true!